linux-kernel - Re: [PATCH v9 4/5] arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time

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Message-ID: <53316D0F.7040600@arm.com>
Date:	Tue, 25 Mar 2014 11:48:31 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	Will Deacon <Will.Deacon@....com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"olof@...om.net" <olof@...om.net>, "arnd@...db.de" <arnd@...db.de>,
	"nico@...aro.org" <nico@...aro.org>,
	"cov@...eaurora.org" <cov@...eaurora.org>,
	Catalin Marinas <Catalin.Marinas@....com>
Subject: Re: [PATCH v9 4/5] arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING
 and pv_time_ops

On 25/03/14 11:19, Stefano Stabellini wrote:
> On Mon, 17 Feb 2014, Catalin Marinas wrote:
>> On Mon, Feb 17, 2014 at 12:25:42PM +0000, Stefano Stabellini wrote:
>>> On Thu, 9 Jan 2014, Stefano Stabellini wrote:
>>>> Introduce CONFIG_PARAVIRT and PARAVIRT_TIME_ACCOUNTING on ARM64.
>>>> Necessary duplication of paravirt.h and paravirt.c with ARM.
>>>>
>>>> The only paravirt interface supported is pv_time_ops.steal_clock, so no
>>>> runtime pvops patching needed.
>>>>
>>>> This allows us to make use of steal_account_process_tick for stolen
>>>> ticks accounting.
>>>>
>>>> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
>>>> CC: will.deacon@....com
>>>> CC: nico@...aro.org
>>>> CC: marc.zyngier@....com
>>>> CC: cov@...eaurora.org
>>>> CC: arnd@...db.de
>>>> CC: olof@...om.net
>>>> CC: Catalin.Marinas@....com
>>>
>>> Catalin, Will, are you happy with this patch for 3.15?
>>
>> It's pretty small and looks fine to me. However, I would like someone
>> with more virtualisation experience than me to ack it (e.g. Marc Z).
> 
> Ping? Marc, could you please give it a review?

Yup, that looks OK to me. It's a generic feature anyway, so I don't see
any harm in enabling it for Xen. We may also use it for KVM at some point.

Acked-by: Marc Zyngier <marc.zyngier@....com>

	M.
-- 
Jazz is not dead. It just smells funny...
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